What do you mean by "build those links"?
If you are asking how long before they are registered by
G or Yahoo, depends on the links and where they are coming
from. Popular Bookmarking, Web 2.0 can show-up in a day or two as
G indexes these sites super fast.

It sounds like you built backlinks and your waiting for the website moderator to approve them, such as blog commenting? If that's the case, you should contact the moderator after building the link so that they are alerted and they will take your backlink seriously and activate it quicker that way. When I build backlinks I only specialize in white hat backlink building techniques and I work with the admin of the site to approve the links. Also make sure you work with ******** links, I can tell you more on this if you need. Hope this helps

You have done 25 backlinks that's good but now it's not added, when you search in Google link:xxxx.com you site you can check how many backlink are created, i will suggest you create some high quality backlink like web 2.0 that's best.

Normally backlinks quality depend how to fast build those link and some links, where you submit your site also depend upon site admin.

You cannot get straight answer for that, it really depends when will Google index your backlinks, while some even won't get indexed at all. However if you ping your backlinks there's a chance they'll be indexed faster.

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